The franchise is famous for its large music memorabilia collection, consisting of more than 70,000 pieces rotated through its restaurants.

Hard Rock's ambition, according to its website, is to provide "the world's most comprehensive visual history of rock 'n' roll."

Some of the company's musical treasures include Jimi Hendrix's Flying V guitar, John Lennon's handwritten lyrics to "Help" and one of Madonna's classic bustiers.

The company is now expanding from its cafe base into the hotel and casino market. It already has 10 hotels and six hotels with casino facilities across the U.S., Asia and Latin America -- but is yet to establish a hold in the European market.

Breaking into such markets has been extremely time consuming, Dodds said. "Gaming in particular is an incredibly good business but it's very difficult. It's highly regulated, there are only certain markets you can go to, " he said. "It's very difficult in terms of barriers to entry."

Dodds believes there is still scope to expand the cafe business globally -- and he's hoping to add one of the world's biggest cities to the list of cafes. "You know, I think there are always little parts of our empire that we haven't quite been able to nail ...but Sao Paolo's one that I think I'd like to get in to," he said.